Fix config loading for Eyeful Tower dataset (#3054)

Add test_filenames to transforms.json generated by eyeful_tower.py

nerfstudio/scripts/downloads/eyeful_tower.py

@@ -261,6 +261,7 @@ def convert_cameras_to_nerfstudio_transforms(
         output["frames"] = frames
         output["train_filenames"] = split_filenames["train"]
         output["val_filenames"] = split_filenames["test"]
+        output["test_filenames"] = []
         return output
 
     @staticmethod